Why did Princess Di have more b alls then Prince Charles?

from what i can see the queen didn't like princess Di and Charles started to not like her too b/c she out did him in the "everyone loves me department." Was Charles jealous and preferred Camilla b/c she's inferior to him in looks and popularity? Why couldn't he do as much as she did to help the people--what else are the royals there for!? A head piece?